AT28C256F-15JC Equivalent & Substitute Parts

Part Overview

The AT28C256F-15JC is a 256Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 32-PLCC package with 150 ns access time. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The part operates within a 4.5V to 5.5V supply range and supports 32K x 8 memory organization with a 3ms write cycle time.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	150 ns
Write Cycle Time	3ms
Voltage Supply	4.5V ~ 5.5V
Package Type	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C

Substitute Part Grouping Explanation

Substitution for the AT28C256F-15JC is determined by the following critical parameters: memory size (256Kbit), memory organization (32K x 8), parallel interface, package type (32-PLCC), and supply voltage (4.5V ~ 5.5V). Access time and write cycle time define performance tiers within compatible substitutes. Parts are grouped into three categories based on these criteria:

Category 1: Direct Functional Equivalents — Parts maintaining identical memory specifications, package, and voltage requirements with matching or faster access times.

Category 2: Performance-Enhanced Substitutes — Parts with improved access time (90 ns or 120 ns) while maintaining all other core specifications.

Category 3: Extended Temperature Range Variants — Parts with identical electrical specifications but expanded operating temperature ranges, suitable for applications requiring broader environmental tolerance.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Access Time (ns)	Write Cycle (ms)	Voltage Supply	Operating Temp (°C)	Package	Product Status	RoHS Status
AT28C256F-15JC	Microchip Technology	256Kbit	150	3	4.5V ~ 5.5V	0 ~ 70	32-PLCC	Obsolete	RoHS non-compliant
AT28C256F-15JU	Microchip Technology	256Kbit	150	3	4.5V ~ 5.5V	-40 ~ 85	32-PLCC	Active	ROHS3 Compliant
AT28HC256F-12JC	Microchip Technology	256Kbit	120	3	4.5V ~ 5.5V	0 ~ 70	32-PLCC	Active	RoHS non-compliant
X28HC256JIZ-15T1	Renesas Electronics	256Kbit	150	5	4.5V ~ 5.5V	-40 ~ 85	32-PLCC	Active	ROHS3 Compliant
X28HC256JIZ-90T1	Renesas Electronics	256Kbit	90	5	4.5V ~ 5.5V	-40 ~ 85	32-PLCC	Active	ROHS3 Compliant
X28HC256JZ-15T1	Renesas Electronics	256Kbit	150	5	4.5V ~ 5.5V	0 ~ 70	32-PLCC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: AT28C256F-15JU (Microchip Technology, active status, extended temperature range) or X28HC256JZ-15T1 (Renesas Electronics, active status, matching temperature range) are suitable selections. Both maintain the original 150 ns access time and 4.5V to 5.5V supply specification.

For Performance Enhancement with Active Product Status: AT28HC256F-12JC (Microchip Technology, 120 ns access time) provides faster performance while maintaining the original operating temperature range and RoHS non-compliant status. X28HC256JIZ-90T1 (Renesas Electronics, 90 ns access time) offers the fastest access time with ROHS3 compliance and extended temperature range.

For Extended Temperature Range Applications: AT28C256F-15JU and X28HC256JIZ-15T1 both support -40°C to 85°C operation, compared to the original 0°C to 70°C specification. Note that Renesas parts (X28HC256 series) specify 5ms write cycle time versus the original 3ms.

For Direct Replacement in Existing Designs: AT28C256F-15JU provides the closest functional match with identical access time (150 ns) and write cycle time (3ms), differing only in extended temperature range and active product status.

Frequently Asked Questions (FAQ)

Q: Can AT28C256F-15JU directly replace AT28C256F-15JC in existing PCB designs?

A: Yes. Both parts share identical memory size (256Kbit), organization (32K x 8), access time (150 ns), write cycle time (3ms), supply voltage (4.5V ~ 5.5V), and 32-PLCC package. The primary differences are product status (active vs. obsolete), RoHS compliance (ROHS3 vs. non-compliant), and operating temperature range (-40°C to 85°C vs. 0°C to 70°C).

Q: What is the impact of selecting X28HC256JIZ-15T1 instead of the original part?

A: The Renesas X28HC256JIZ-15T1 maintains 256Kbit capacity, 32K x 8 organization, 150 ns access time, 4.5V to 5.5V supply, and 32-PLCC package. The write cycle time increases from 3ms to 5ms. Operating temperature extends to -40°C to 85°C. RoHS3 compliance and active product status are provided.

Q: Are there performance trade-offs when selecting faster access time variants?

A: AT28HC256F-12JC (120 ns) and X28HC256JIZ-90T1 (90 ns) provide faster access times than the original 150 ns specification. Both maintain 256Kbit capacity and 32-PLCC package. AT28HC256F-12JC retains 3ms write cycle time; X28HC256JIZ-90T1 specifies 5ms write cycle time. These are performance improvements, not trade-offs.

Q: What packaging format differences exist among substitute parts?

A: AT28C256F-15JC and AT28C256F-15JU use standard tube packaging. X28HC256JIZ-15T1, X28HC256JIZ-90T1, and X28HC256JZ-15T1 use Tape & Reel (TR) packaging. All parts use identical 32-PLCC (13.97x11.43) package type suitable for surface mount assembly.

Q: Which substitute part offers the best compliance profile for new designs?

A: AT28C256F-15JU and X28HC256JIZ-15T1 both provide ROHS3 compliance with active product status. AT28C256F-15JU maintains the original operating temperature range (0°C to 70°C) with Microchip Technology sourcing. X28HC256JIZ-15T1 extends temperature range to -40°C to 85°C with Renesas Electronics sourcing.

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